Athosanswered grow question 7 years ago Take a picture under natural or white light, the purple light makes it really hard to actually tell anything about your plants.
As for going overboard. Get an EC/TDS/PPM meter to check check the level of nutrient to use, specially if you plan to use epsom salts, that stuff is really strong and you most probably will burn your plant if you try to use it without a sure way to measure the strength of the solution